Rigid Metal Conduit (RMC) is generally made of which materials?

Rigid Metal Conduit (RMC) is primarily made of galvanized steel and aluminum. Galvanized steel is commonly used due to its strength, durability, and resistance to corrosion, making it suitable for a wide range of environments, including outdoor and industrial applications. Aluminum, while lighter than steel, also offers excellent resistance to corrosion and is used in situations where weight is a concern or where exposure to corrosive elements may be prevalent.

The other materials mentioned in the other options are not generally used for RMC. For example, copper is not typically used for conduit applications due to its cost and susceptibility to corrosion in certain environments. PVC, while a popular choice for non-metallic conduits due to its low cost and resistance to moisture, does not possess the strength required for RMC applications. These properties of galvanized steel and aluminum make them the preferred materials for rigid metal conduits.